Earths climate - 1st law - seas role

11 important questions on Earths climate - 1st law - seas role

How is lifetime of GHG calculated?

Burden(mass)/removal rate (mass yr^-1)

What is the lifetime of carbonmonooxide?

Days to weeks

What are the wind cells called from equator to the polars?

Hadley cell- Ferell cell- polar cell
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Which direction does coriolis force the wind on NH?

To the right

What happens when air moves towards low pressure zone in NH?

It moves around it counter clockwise due to coriolis effect

How deep is the oceanic surface layer?

50-100 meter except for well developed currents

How does the water converge at the centre of a Gyre?

Because of the Ekman transport?

What is ekman transport?

Ekman transport is the net movement of water in the ocean caused by wind.
  • It occurs at the surface of the ocean
  • The direction of Ekman transport is 90 degrees to the right of the wind direction in the Northern Hemisphere
    • In the Southern Hemisphere, it is 90 degrees to the left of the wind direction

How much higher can the water level be at the centre of the Gyre?

1-2 meters higher than at the edges

Why does the water sink at the Antartic?

Decrease in T and increase in Salinity --> increase in density
high winds, strong cooling, evaporation
sea-ice formation, excluding sea salts
sea-ice also block radiation

Why do you not find any plankton at the middle of the Gyres?

Since this area has downwelling no nutrients are available for the plankton

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